somebody decided heinrich needed endless ghosts coming from every direction which you cannot even properly block with terrain. So no matter where you are in the fight or what you are doing. You are going to die before heinrich gets close to it.
So in order to see the credits, I have to suffer and endure a battle with undodgeable dmg that eats your entire health bar.
Onto another game. Close enough is good enough when the fun dries up.

He does not spawn the ghosts if you stay in the "ritual circle area".

If that's all it takes that's fine enough. Time for him to die.